[MUSIC PLAYING] Hi, my name is Cai [INAUDIBLE]. I'm an LED Drivers Engineer at Texas Instruments. Today, we are going to look at our demonstration of the performance and the features of the market's first specialized RGB LED driver, LP50.
Most traditional LED drivers are designed for single color LEDs in which the PWM generator is used for brightness control only. LP50 family integrates eight-bit PWM for LED color setting and additional eight-bit PWM for brightness control, which can help to achieve ultra-smooth color and brightness changing effect. These two eight-bit PWM merge to 12-bit PWM automatically. Thus the LP50 device improves user experience in color mixing and brightness control from both VLED [INAUDIBLE] and coding efforts perspective.
Meanwhile, the device internal PWM generator is dimming at 29 kilohertz from this which is out of audible noise range. And this helps to eliminate system noise a lot, especially for space-constrained audio equipment like Bluetooth speaker, smart speaker, soundbar, and so on.
Furthermore, LP50 enters Power Save mode automatically, when all the outputs are turned off for a certain period, with only 10 microampere ultra-low quiescent current consumptive. And the system power is saved significantly.
The LP50 LED demo has a RGB LED ring on the top side which is made up of 16 RGB LEDs. If using 24-channel LED driver LP5024, each LED driver is able to control 8 RGB LEDs. So there are two LP5024 devices on the bottom side. This LP50 demo is controlled by the MSP432 launchpad which is connected through booster pack connector.
Now, I'm going to demonstrate the effects that the LP50 LED driver can achieve. On the bench here, we have the LP50 demo and on the MSP432 launchpad used to for control and power supply.
Firstly, let's take a look at the benefits of the LP50 in breathing effect. After powering up, the microcontroller will load the breathing effect into the LP50. And the LP50 demo will start to run accordingly.
LP50 has three banks, and each channel can be configured to any bank. For example, you can easily set LED0 and LED8 as green and other LEDs in breathing effect since bank function yields uses one register to control or configure the channels. If it decreases a lot of MCU loading which is easy and efficient for the breathing effect.
LP50 integrates both linear and logarithmic brightness dimming control. As you can see from the video, logarithmic brightness dimming control can achieve a better visual LED breathing effect than linear dimming control.
Currently, most LED drivers integrate up to 64 steps logarithm dimming which is not enough for human visual effect, especially when the breathing period is long. For example, when the total breathing period is three seconds, as the video shows, 255 steps, in the right, will result to most effective than the 64 steps in the left.
Now, let's enjoy all the effects that the LP50 demo can achieve. I hope you enjoyed learning about the LP50 high-accuracy RGB LED driver and the fantastic effects it can help you to achieve in your LED lighting system.
[MUSIC PLAYING]
For more information, please visit our website. Thank you for watching.

詳細

日付:
2018年 10月 29日

Achieving ultra-smooth animation and color doesn't have to be difficult. With TI's easy-to-use 12-bit PWM drivers, you can achieve incredible effects for your human machine interface applications while benefitting from the device's low Iq. Watch to see a quick demo of an LP50x LED ring in action, as well learn about RGB bank function and integrated linear/logarithmic brightness control.